Reproduction of White-Tailed Jackrabbits on Semi-Arid Range

Abstract

Reproduction in lagomorphs may be sensitive to adverse winter conditions or summer drought. Consequently, I studied white-tailed jackrabbits (Lepus townsendii) in Wyoming, from 1985 to 1987, to evaluate their reproductive pattern and fertility on semi-arid range. The breeding season of white-tailed jackrabbits began between late February and mid-March and ended in july. Breeding began later in 1986 and 1987 (2 yr with sparse snow cover) than in 1985 (when greater late-winter snow accumulation occurred). I detected no effect of ambient temperature on the onset of breeding. Reproductively active females conceived in approximate synchrony, and litters were produced during 3 distinct periods each year